Commit | Line | Data |
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da0e8fb0 VB |
1 | /* |
2 | * EHCI HCD (Host Controller Driver) for USB. | |
3 | * | |
4 | * Bus Glue for PPC On-Chip EHCI driver on the of_platform bus | |
5 | * Tested on AMCC PPC 440EPx | |
6 | * | |
7 | * Valentine Barshak <vbarshak@ru.mvista.com> | |
8 | * | |
9 | * Based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> | |
10 | * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> | |
11 | * | |
12 | * This file is licenced under the GPL. | |
13 | */ | |
14 | ||
15 | #include <linux/signal.h> | |
16 | ||
17 | #include <linux/of.h> | |
18 | #include <linux/of_platform.h> | |
19 | ||
20 | /* called during probe() after chip reset completes */ | |
21 | static int ehci_ppc_of_setup(struct usb_hcd *hcd) | |
22 | { | |
23 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); | |
24 | int retval; | |
25 | ||
26 | retval = ehci_halt(ehci); | |
27 | if (retval) | |
28 | return retval; | |
29 | ||
30 | retval = ehci_init(hcd); | |
31 | if (retval) | |
32 | return retval; | |
33 | ||
34 | ehci->sbrn = 0x20; | |
35 | return ehci_reset(ehci); | |
36 | } | |
37 | ||
38 | ||
39 | static const struct hc_driver ehci_ppc_of_hc_driver = { | |
40 | .description = hcd_name, | |
41 | .product_desc = "OF EHCI", | |
42 | .hcd_priv_size = sizeof(struct ehci_hcd), | |
43 | ||
44 | /* | |
45 | * generic hardware linkage | |
46 | */ | |
47 | .irq = ehci_irq, | |
48 | .flags = HCD_MEMORY | HCD_USB2, | |
49 | ||
50 | /* | |
51 | * basic lifecycle operations | |
52 | */ | |
53 | .reset = ehci_ppc_of_setup, | |
54 | .start = ehci_run, | |
55 | .stop = ehci_stop, | |
56 | .shutdown = ehci_shutdown, | |
57 | ||
58 | /* | |
59 | * managing i/o requests and associated device resources | |
60 | */ | |
61 | .urb_enqueue = ehci_urb_enqueue, | |
62 | .urb_dequeue = ehci_urb_dequeue, | |
63 | .endpoint_disable = ehci_endpoint_disable, | |
b18ffd49 | 64 | .endpoint_reset = ehci_endpoint_reset, |
da0e8fb0 VB |
65 | |
66 | /* | |
67 | * scheduling support | |
68 | */ | |
69 | .get_frame_number = ehci_get_frame, | |
70 | ||
71 | /* | |
72 | * root hub support | |
73 | */ | |
74 | .hub_status_data = ehci_hub_status_data, | |
75 | .hub_control = ehci_hub_control, | |
76 | #ifdef CONFIG_PM | |
77 | .bus_suspend = ehci_bus_suspend, | |
78 | .bus_resume = ehci_bus_resume, | |
79 | #endif | |
a8e51775 | 80 | .relinquish_port = ehci_relinquish_port, |
3a31155c | 81 | .port_handed_over = ehci_port_handed_over, |
914b7012 AS |
82 | |
83 | .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, | |
da0e8fb0 VB |
84 | }; |
85 | ||
86 | ||
87 | /* | |
88 | * 440EPx Errata USBH_3 | |
89 | * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 | |
90 | */ | |
91 | #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) | |
92 | static int __devinit | |
93 | ppc44x_enable_bmt(struct device_node *dn) | |
94 | { | |
95 | __iomem u32 *insreg_virt; | |
96 | ||
97 | insreg_virt = of_iomap(dn, 1); | |
98 | if (!insreg_virt) | |
99 | return -EINVAL; | |
100 | ||
101 | out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); | |
102 | ||
103 | iounmap(insreg_virt); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | ||
d35fb641 | 108 | static int __devinit ehci_hcd_ppc_of_probe(struct platform_device *op) |
da0e8fb0 | 109 | { |
61c7a080 | 110 | struct device_node *dn = op->dev.of_node; |
da0e8fb0 | 111 | struct usb_hcd *hcd; |
796bcae7 | 112 | struct ehci_hcd *ehci = NULL; |
da0e8fb0 VB |
113 | struct resource res; |
114 | int irq; | |
115 | int rv; | |
116 | ||
796bcae7 VB |
117 | struct device_node *np; |
118 | ||
da0e8fb0 VB |
119 | if (usb_disabled()) |
120 | return -ENODEV; | |
121 | ||
122 | dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); | |
123 | ||
124 | rv = of_address_to_resource(dn, 0, &res); | |
125 | if (rv) | |
126 | return rv; | |
127 | ||
128 | hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); | |
129 | if (!hcd) | |
130 | return -ENOMEM; | |
131 | ||
132 | hcd->rsrc_start = res.start; | |
133 | hcd->rsrc_len = res.end - res.start + 1; | |
134 | ||
135 | if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { | |
f45ba776 | 136 | printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__); |
da0e8fb0 VB |
137 | rv = -EBUSY; |
138 | goto err_rmr; | |
139 | } | |
140 | ||
141 | irq = irq_of_parse_and_map(dn, 0); | |
142 | if (irq == NO_IRQ) { | |
f45ba776 | 143 | printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__); |
da0e8fb0 VB |
144 | rv = -EBUSY; |
145 | goto err_irq; | |
146 | } | |
147 | ||
148 | hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); | |
149 | if (!hcd->regs) { | |
f45ba776 | 150 | printk(KERN_ERR "%s: ioremap failed\n", __FILE__); |
da0e8fb0 VB |
151 | rv = -ENOMEM; |
152 | goto err_ioremap; | |
153 | } | |
154 | ||
155 | ehci = hcd_to_ehci(hcd); | |
796bcae7 VB |
156 | np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); |
157 | if (np != NULL) { | |
158 | /* claim we really affected by usb23 erratum */ | |
159 | if (!of_address_to_resource(np, 0, &res)) | |
160 | ehci->ohci_hcctrl_reg = ioremap(res.start + | |
161 | OHCI_HCCTRL_OFFSET, OHCI_HCCTRL_LEN); | |
162 | else | |
f45ba776 | 163 | pr_debug("%s: no ohci offset in fdt\n", __FILE__); |
796bcae7 | 164 | if (!ehci->ohci_hcctrl_reg) { |
f45ba776 | 165 | pr_debug("%s: ioremap for ohci hcctrl failed\n", __FILE__); |
796bcae7 VB |
166 | } else { |
167 | ehci->has_amcc_usb23 = 1; | |
168 | } | |
169 | } | |
da0e8fb0 VB |
170 | |
171 | if (of_get_property(dn, "big-endian", NULL)) { | |
172 | ehci->big_endian_mmio = 1; | |
173 | ehci->big_endian_desc = 1; | |
174 | } | |
175 | if (of_get_property(dn, "big-endian-regs", NULL)) | |
176 | ehci->big_endian_mmio = 1; | |
177 | if (of_get_property(dn, "big-endian-desc", NULL)) | |
178 | ehci->big_endian_desc = 1; | |
179 | ||
180 | ehci->caps = hcd->regs; | |
181 | ehci->regs = hcd->regs + | |
182 | HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); | |
183 | ||
184 | /* cache this readonly data; minimize chip reads */ | |
185 | ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); | |
186 | ||
187 | if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { | |
188 | rv = ppc44x_enable_bmt(dn); | |
189 | ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", | |
190 | rv ? "NOT ": ""); | |
191 | } | |
192 | ||
193 | rv = usb_add_hcd(hcd, irq, 0); | |
08a3b3b1 DC |
194 | if (rv) |
195 | goto err_ehci; | |
196 | ||
197 | return 0; | |
da0e8fb0 | 198 | |
08a3b3b1 DC |
199 | err_ehci: |
200 | if (ehci->has_amcc_usb23) | |
201 | iounmap(ehci->ohci_hcctrl_reg); | |
da0e8fb0 VB |
202 | iounmap(hcd->regs); |
203 | err_ioremap: | |
204 | irq_dispose_mapping(irq); | |
205 | err_irq: | |
206 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
207 | err_rmr: | |
208 | usb_put_hcd(hcd); | |
209 | ||
210 | return rv; | |
211 | } | |
212 | ||
213 | ||
2dc11581 | 214 | static int ehci_hcd_ppc_of_remove(struct platform_device *op) |
da0e8fb0 VB |
215 | { |
216 | struct usb_hcd *hcd = dev_get_drvdata(&op->dev); | |
796bcae7 VB |
217 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
218 | ||
219 | struct device_node *np; | |
220 | struct resource res; | |
221 | ||
da0e8fb0 VB |
222 | dev_set_drvdata(&op->dev, NULL); |
223 | ||
224 | dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); | |
225 | ||
226 | usb_remove_hcd(hcd); | |
227 | ||
228 | iounmap(hcd->regs); | |
229 | irq_dispose_mapping(hcd->irq); | |
230 | release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | |
231 | ||
796bcae7 VB |
232 | /* use request_mem_region to test if the ohci driver is loaded. if so |
233 | * ensure the ohci core is operational. | |
234 | */ | |
235 | if (ehci->has_amcc_usb23) { | |
236 | np = of_find_compatible_node(NULL, NULL, "ibm,usb-ohci-440epx"); | |
237 | if (np != NULL) { | |
238 | if (!of_address_to_resource(np, 0, &res)) | |
239 | if (!request_mem_region(res.start, | |
240 | 0x4, hcd_name)) | |
241 | set_ohci_hcfs(ehci, 1); | |
242 | else | |
243 | release_mem_region(res.start, 0x4); | |
244 | else | |
f45ba776 | 245 | pr_debug("%s: no ohci offset in fdt\n", __FILE__); |
796bcae7 VB |
246 | of_node_put(np); |
247 | } | |
248 | ||
249 | iounmap(ehci->ohci_hcctrl_reg); | |
250 | } | |
da0e8fb0 VB |
251 | usb_put_hcd(hcd); |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | ||
d35fb641 | 257 | static void ehci_hcd_ppc_of_shutdown(struct platform_device *op) |
da0e8fb0 VB |
258 | { |
259 | struct usb_hcd *hcd = dev_get_drvdata(&op->dev); | |
260 | ||
261 | if (hcd->driver->shutdown) | |
262 | hcd->driver->shutdown(hcd); | |
da0e8fb0 VB |
263 | } |
264 | ||
265 | ||
c4386ad0 | 266 | static const struct of_device_id ehci_hcd_ppc_of_match[] = { |
da0e8fb0 VB |
267 | { |
268 | .compatible = "usb-ehci", | |
269 | }, | |
270 | {}, | |
271 | }; | |
272 | MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); | |
273 | ||
274 | ||
d35fb641 | 275 | static struct platform_driver ehci_hcd_ppc_of_driver = { |
da0e8fb0 VB |
276 | .probe = ehci_hcd_ppc_of_probe, |
277 | .remove = ehci_hcd_ppc_of_remove, | |
278 | .shutdown = ehci_hcd_ppc_of_shutdown, | |
4018294b GL |
279 | .driver = { |
280 | .name = "ppc-of-ehci", | |
281 | .owner = THIS_MODULE, | |
282 | .of_match_table = ehci_hcd_ppc_of_match, | |
da0e8fb0 VB |
283 | }, |
284 | }; |